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Message-Id: <20241030113946.229361-3-james.clark@linaro.org>
Date: Wed, 30 Oct 2024 11:39:45 +0000
From: James Clark <james.clark@...aro.org>
To: linux-perf-users@...r.kernel.org,
acme@...nel.org,
namhyung@...nel.org,
irogers@...gle.com,
tim.c.chen@...ux.intel.com
Cc: James Clark <james.clark@...aro.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
Yicong Yang <yangyicong@...ilicon.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] perf stat: Also hide metric-units from JSON when event didn't run
We decided to hide NULL metric-units rather than showing it as "(null)"
when a dependent event for a metric doesn't exist. But on hybrid systems
if the process doesn't hit a PMU you get an empty string metric unit
instead. To make it consistent change all empty strings to NULL.
Note that metric-threshold is already hidden in this case without this
change.
Where a process only runs on cpu_core and never hits cpu_atom:
Before:
$ perf stat -j -- true
...
{"counter-value" : "<not counted>", "unit" : "", "event" : "cpu_atom/branch-misses/", "event-runtime" : 0, "pcnt-running" : 0.00, "metric-value" : "0.000000", "metric-unit" : ""}
{"counter-value" : "6326.000000", "unit" : "", "event" : "cpu_core/branch-misses/", "event-runtime" : 293786, "pcnt-running" : 100.00, "metric-value" : "3.553394", "metric-unit" : "of all branches", "metric-threshold" : "good"}
...
After:
...
{"counter-value" : "<not counted>", "unit" : "", "event" : "cpu_atom/branch-misses/", "event-runtime" : 0, "pcnt-running" : 0.00}
{"counter-value" : "5778.000000", "unit" : "", "event" : "cpu_core/branch-misses/", "event-runtime" : 282240, "pcnt-running" : 100.00, "metric-value" : "3.226797", "metric-unit" : "of all branches", "metric-threshold" : "good"}
...
Signed-off-by: James Clark <james.clark@...aro.org>
---
tools/perf/util/stat-display.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index a5d72f4a515c..0e16eecfbad8 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -854,7 +854,8 @@ static void printout(struct perf_stat_config *config, struct outstate *os,
if (run == 0 || ena == 0 || counter->counts->scaled == -1) {
if (config->metric_only) {
- pm(config, os, METRIC_THRESHOLD_UNKNOWN, "", "", 0);
+ pm(config, os, METRIC_THRESHOLD_UNKNOWN, /*format=*/NULL,
+ /*unit=*/NULL, /*val=*/0);
return;
}
@@ -909,7 +910,7 @@ static void printout(struct perf_stat_config *config, struct outstate *os,
perf_stat__print_shadow_stats(config, counter, uval, aggr_idx,
&out, &config->metric_events);
} else {
- pm(config, os, METRIC_THRESHOLD_UNKNOWN, /*format=*/NULL, /*unit=*/"", /*val=*/0);
+ pm(config, os, METRIC_THRESHOLD_UNKNOWN, /*format=*/NULL, /*unit=*/NULL, /*val=*/0);
}
if (!config->metric_only) {
--
2.34.1
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